Electric piano playing video recording camera simple tutorial (previous post) Foreword Landlord bought an electric piano last year, embarked on the road of middle-aged people learning piano (also in Aunt Zhang sent out of the box), now half past It's also easy to play a simple song. So there was a careful thought of playing video in the circle of friends, and did not think much about it at first. Because the video of other people playing at the piano usually did not feel so complicated, so I wanted to set up a mobile phone. It was only then that it was not as simple as it was imagined. . .å‘ç½åmk2 | Likes 7 Comments33 Collections85 View Details (continued) Third, a failed attempt When we first started thinking about ways to improve the quality of recordings, (zizuo) clever landlords thought: “Is it not possible to connect a microphone to a mobile phone? That is, there is an audio input port, and the output audio of the steel cable is directly connected to the mic port of the mobile phone, and then You can use your phone to record it, perfect! To do it, the first problem to be solved is the phone's 3.5MM audio port (that is, the one that Apple cannot bear to kill). This interface is a four-part interface with mic input and headphone output. It is not possible to directly input audio. It is necessary to separate the mic port and headphone port, so we need such a thing. Green Alliance (UGREEN) 30620 Earphone Microphone One-to Two Extension Cable 3.5 Audio Cable Mobile Phone Headphones Combo Converter Laptop Headphone Splitter Black 19.9 Yuan Jingdong Direct Link Then, the piano sound source is output through the pair of recording lines and connected to the mic port of the mobile phone. Because the landlord's 525 electric piano output port is 6.5MM audio port, so the line to buy 6.5MM 3.5MM audio male to male models (or transfer interface +3.5mm on the recording line). Green Union (UGREEN) 10628 3.5 to 6.5 audio cable 3.5mm to 6.5mm male to male mobile computer audio speaker cable connector 6.35 amplifier mixer plug 2 meters 35 yuan Jingdong direct link The connection between the electric piano and the mobile phone is as follows: After connecting according to the above figure, you can record according to the truth. I used a mobile phone's own recorder APP for a recording test and found that: I can't record! No matter if the piano's volume is large or small, only the rustling noise is recorded. The sound of the piano is not at all! Then changed the phone, changed the tablet, changed the notebook, the results are similar, excluding equipment problems, but when using the notebook, in the rustling can hear a little bit of the piano key sound. What's the matter, is it a problem with the line bought? So he changed the new thread again, but the problem remains Since there is no problem with equipment and equipment, it is definitely a problem with the program itself. After some research, the problem has finally been discovered: The microphone MIC port is different from the audio line input port (Line in)! Therefore, these two ports on the sound card are distinguished by pink (MIC port) and blue (Line in port), respectively, and cannot be mixed. First talk about the concept of two interfaces: 1, microphone interface / MIC / microphone interface, pre-amplifier circuit, used to connect microphones and other output level of small radio equipment, sound card in pink; 2, Line in mouth / AUX mouth / musical instrument input port, there is no amplifying circuit, is used for connecting the electric guitar, electronic organ, synthesizer and other external equipment audio signal output recording, the sound card is represented by blue. In general, the output level of the microphone is very small, so the mic interface will have an amplifier circuit to amplify the signal, and then included; and line in docking is a direct source audio output, the signal level itself is already strong enough, so there is no need to amplify It can be included directly. It is very rigorously illustrated that if a mobile phone's sound signal coverage ranges from 1 to 100, then the signal strength less than 1 will not be recorded, and the intensity greater than 100 will not record distortion. The output signal strength of the microphone is about 0.1~10. The MIC port has a built-in amplifier with a signal amplification of 10 times. Therefore, if the microphone is connected to the mic interface, the actual recorded signal is 0.1~10 X 10 = 1~100 and can be recorded normally. According to this setting, the signal strength of the audio output of an electric instrument is approximately 10 to 100. When the line in port is used, the final signal strength is 10 to 100 because no amplification is performed, so ordinary recording equipment can also be recorded normally. Then, according to the scheme used above, connect the output of the electric piano to the MIC port of the mobile phone, and the signal strength of the output is 10~100 X 10 = 100-1000, which is far beyond the recording signal strength range of the mobile phone (1~100). Naturally, You can't record normally. After learning the principle and learning the pose, we can get a solution: need such a device, or mic mouth recording signal strength can withstand 1 ~ 1000 strength, or equipment with line in interface (recording pen, sound card, etc.) . The landlord is using the first solution. Fourth, use Sony a7 micro single video tutorial Sony (SONY) ILCE-7K full-format micro-single-mirror standard kit (24,300 effective pixels 28-70mm lens F3.5-5.6 a7K/α7K) 7799 yuan Sony full-frame A7 kit, compact body high-quality Jingdong direct link View Encyclopedia The landlord had a 7-micro single Alpha card of Alpha card in the service (chi) service. After encountering the above problem, he only remembered this thing as a camera capable of recording video, and it should have an audio input interface. Also bring the line in mouth! Excitedly flipping out a7, excitedly opened the interface cover. . . Nima is also pink! Do not give up, checked under the judges network, clearly writes that the microphone interface. . . . . Still do not give up, even on the piano, try to know! Connect the electric piano and a7, and then start the video mode. The finger flicks quickly on the piano. Open playback to see the effect, a play, immediately is the sand rustling noise. . . . Ouch? No, there is a clear piano sound in Shashasha! This has greatly affected my Dafa. It seems that the range of input signals for this mic port is very large. There is no problem with the direct input of musical instruments. It is because the belief in Falun Dafa is recharged. As for the rustling, easy to handle, it is estimated that the bottom noise of the electric piano, the a7 recording volume is adjusted to the lowest (in fact, the signal amplification is minimized to the minimum) is not obvious, and then the volume of the electric piano is adjusted properly ok . In addition, when recording a video, you can display the volume in real time (see CH1 and CH2 circled in the figure below to indicate the signal strength of the channel). When you adjust the piano volume, be careful to control the maximum sound of the piano without exceeding the signal range. (If exceeded, it will be displayed. Red warning) It is recommended that the piano volume be controlled at about 3/4 of the volume signal bar, and the effect is better. After such a setting, the effect is better. Organize specific video tutorials (Sony A7, for example, the principle is common): 1, equipment: Sony a7 micro single, audio pair recording line (6.5MM to 3.5MM), electric piano, tripod 2. Connection: The audio connects the piano headphone outlet to the side of the recording cable and the pink mic port of a7 to the other side. 3, set: 1) Adjust the recording volume setting of a7 to the lowest (volume: 1) 2) Adjust the volume of the electric piano until the electric piano is loudest. The volume bar of CH1 and CH2 displayed on a7 does not exceed 3/4, let alone rise to the red alarm point. 3) Back to listen: Generally the electric piano will have two headphone output ports. At this time, the headphone can be connected to another headphone port to listen to the sound; if the electric piano has only one headphone port, it does not matter, the headphone can connect to the headphone port of a7 (green). A7 will output back in real time. 4, video settings: 1) Placement: The camera is mounted on a tripod, and then the camera position and angle are set according to the focal length of the lens used and the desired shooting angle. The aperture is controlled and the main keyboard range is clearly recorded. 2) Image quality and number of frames: It is recommended to select a high quality and number of frames as much as possible; if using the manual mode, pay attention to the shutter speed is not greater than 1/50 seconds, otherwise it will affect the smoothness of the screen. 3) Video format: With Dafa machines, the basic choice is AVCHD, and the output video format is .mts 5. Editing, uploading and sharing (taking the uploading Bibibili website as an example) 1) Transcoding Download a b station transcoder: Small Biliili customized version Unzip to open, and then select the desired video file (note that the software does not see the .mts file by default. You need to select “All Files†in the File Type drop-down box to see it. The actual transcoding is OK). Click Cheers to wait. Output. 2) Clips For pure video segmentation, Ultra Video Splitter software is recommended. Select the time period required in the video. Select “Consistent with the source file†for video and audio encoding to avoid re-squeezing the video and complete video segmentation in a matter of moments. If you need to edit the video, add special effects, cover, etc., you'll need to find a special video editing software. 3) Contribution After the video has been transcoded and edited, it can be uploaded to the B station for submission. After the video is successfully released, the video can be shared with the microblog and friends circle. The end of a knot: Since the Dafa micro-single can be directly recorded, other digital cameras, micro-singles, SLRs, dvs and the like should also be available (especially Dafa's own equipment, the standard should be unified), and there may be equipment on hand to try. , but pay attention to the interface of the match, buy the right model of the record line. If you can't, you don't need to be reluctant. After all, the mic design doesn't support the output of the instrument, or it's better to have a special sound card/recording pen. This content will be here first. The above contents are all my own experiences and I welcome everyone's discussion. As for the use of soundcards, voice recorders, post-composition and other tutorials, because I have not personally practiced them, I can only introduce and introduce them based on the information found. This is not what we have done in this article. Time to open a piece of popular science.